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Meaning of exhalant

ex•hal•ant

Pronunciation: (eks-hā'lunt, ek-sā'-), [key]
— adj.
  1. exhaling; emitting.
—n.
  1. something that exhales, as the ducts of certain mollusks.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.